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package com.kkks.spring_rest.tick.utils;

import com.sun.jersey.core.util.Base64;    
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * 3Des帮助类
 * 
 */
public class ThreeDESHelper {

    private static final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish
    private static byte[] keybyte = {0x11, 0x28, 0x4F, 0x58,
        (byte) 0x88, 0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51,
        (byte) 0xCB, (byte) 0xDD, 0x55, 0x66, 0x77, 0x29, 0x74,
        (byte) 0x98, 0x30, 0x40, 0x36, (byte) 0xE2
    }; //24字节的密钥

    public static String encryptMode(String src) {
        String encrypt = null;
        try {
            byte[] ret = encryptMode(src.getBytes("UTF-8"));
            encrypt = new String(Base64.encode(ret)); 
            System.out.println("encrypt="+encrypt);
        } catch (Exception e) {
            System.out.print(e);
        }
        return encrypt;
    }

    public static String decryptMode(String src) {
        String decrypt = null;
        try {
            byte[] ret = decryptMode(Base64.decode(src)); 
            decrypt = new String(ret, "UTF-8");
        } catch (Exception e) {
            System.out.print(e);
        }
        return decrypt;
    }

    /**
     * 加密
     * @param src
     * @return 
     */
    private static byte[] encryptMode(byte[] src) {
        try {
            //生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
            //加密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.ENCRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     * @param src
     * @return 
     */
    private static byte[] decryptMode(byte[] src) {
        try {
            //生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
            //解密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.DECRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    //转换成十六进制字符串
    public static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1) {
                hs = hs + "0" + stmp;
            } else {
                hs = hs + stmp;
            }
            if (n < b.length - 1) {
                hs = hs + ":";
            }
        }
        return hs.toUpperCase();
    }

    // for test
    public static void main(String[] args) {

//        //添加新安全算法,如果用JCE就要把它添加进去
//        Security.addProvider(new com.sun.crypto.provider.SunJCE());

        String szSrc = 126003 + "davelin@125.com17 May 2011 16:03:36 GMT";
        System.out.println("加密前的字符串:" + szSrc);

        String encoded = encryptMode(szSrc);
        System.out.println("加密后的字符串:" + encoded);

        String srcStr = decryptMode(encoded);
        System.out.println("解密后的字符串:" + srcStr);
    }
}
